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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fe6b5ce73121bd0cedaf6126e0c4fe0193b1c27ea81fa0c52117ada690c6d59' 
  AND token = 'bj76dKuWD6VWV2Y3vEsTDeK06GOgoDvbqZ/N8QFfdm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}